Apparatus for grinding and polishing.



PATENTED MAR. 5, 1907.

P. L, 0. WADSWORTH. APPARATUS FOR GRINDING AND POLISHING.

APPLICATION FILED JUNE 24, 1905.

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' WITNESSES UNITEI.) STATES PATENT OFFICE.

FRANK L. o. wanswon'rn, or MORGANTOWN, WEST VIRGINIA, Assie'NoR V TO PRESSED PRISMPLATE GLASS COMPANY, OF NEW YORK, N Y., A

CORPORATION OF WEST VIRGINIA.

APPARATUS FOR GRINDING AND POLlSHlNGi Specification of Letters Patent.

Application filed June 24, 1905. Serial No. 266,696.

ful Apparatus for Grinding'and Polishing, of

which the following is a full, clear, and exact description, reference being had to the ac companying drawings, forming part of this specification, in which I O Y Figure l is a bottom plan view of a grinding-shoe embodying my invention, and Fig. 2 is an elevation partly in section,

My invention relates to the class of grinding and polishing machines for' plate-glass, and is designed to increase the speed of the operation and at the same time improve the action of the grinding or polishing surfaces upon the glass.

It consists in a novel construction of the grinding blocks or shoes.

One of the features of the invention lies in the peculiar coi'istructiol'i of the. grindingshoes. As shown in Fig. 1, these shoes 2 consist, preferably, of sector or wedge shaped castings, which may besocured by bolts.3,

extending through five holes in each shoe. These shoes may be cast interchangeably, so that they can he removed and replaced withrunners.

The lower face of the casting 1s provided with a series of grooves 4,tl1e general direction. of which is inclined both to the radiusand circumference of the general circle of the disk. The grooves extend in a zigzag direction continuously from one radial edge of the shoes to the opposite radial edge, their ends communicating with the radially-extending spaces between the edges of adjacent shoes. The grooves are also preferably made in zigzag or sinuous iorm, as shown, so that the sand will travel through them at an uneven rate. It travels faster in those parts approaching circumferential lines and slower in the parts approaching the radial lines. This retains the sand for short intervals of time in the radial portions "of the grooves and makes the grinding action more rapid.

As the movement of the table is in the same direction as that of the disks and at a higher speed, the motion of the table will a force the-sand through the grooves at one side of the segment and suck it through the grooves on the opposite side at any given moment. The movement of the sand Patented March 5, 1907.

through the grooves is therefore made positive and the grinding action more rapid.

Many changes may be -.n1ade in the form. and arrangement of the various parts without departing from my invention.

I clann i. In a glass-grinding apparatus, a disk having shoes of sector or wedge shape form radiating lrom the center of the o provided with grooves which extend continuously from one radial edge of the shoe to the opposite radial edge; substantially as deislr and being approximately radial, and other portions thereof being approximately circum ferential in direction; substantially as described.

3. A grinding-disk having shoes with zigzag or sinuous grooves extending continuously from one radial edge of the shoes to the other; substantially as described.

4. A grinding-disk having a series of separated sector shaped shoes formed with zig-' zag grooves extending from one radial'cdge" of the shoe to the opposite radial edge; substantially as described. I

5. A grinding-shoe having therein-a rality of zigzag grooves, portions of w ich extend in substantially radial directions, and

other portions of Wlnchextend in-substan-,

tiall'y circumferential directions; substantially asdesc'ribed.

I In testimony whereof I have minimise my hand.

y FRANK L. O. I Witnesses: Gno. B. Bmrmme,

Joan MIL ER 

